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DateValue# returns a serial number that represents the date of the argument.
 
DateValue# (datetext$)
    ■ The argument datetext$ can have date formats such as
      "December 30, 1988", "30/12/88 2:24 AM", and "28-Dec-1988".
    ■ If the year part of date is omitted, DateValue# uses the current year
      from your computer's system date.
    ■ Time information, if included in the argument, is ignored.
 
Usage Notes
    ■ For information on serial numbers, see ◄Serial Numbers►.
 
Important
    ■ To use DateValue# in the QBX environment, use the FINANCER.QLB
      Quick library. To use DateValue# outside the QBX environment, link
      your program with the appropriate DTFMTxx.LIB file. Depending on
      the compiler options you chose when you installed BASIC, one or
      more of the following files will be available:
 
           Filename         Compiler options
           ════════════     ═════════════════════════════════════════════
           DTFMTER.LIB      80x87 or emulator math; DOS or OS/2 real mode
           DTFMTAR.LIB      Alternate math; DOS or OS/2 real mode
           DTFMTEP.LIB      80x87 or emulator math, OS/2 protected mode
           DTFMTAP.LIB      Alternate math; OS/2 protected mode
 
    ■ The DATIM.BI header file contains the necessary function
      declarations for DateValue#.
    ■ For more information on using libraries, see "Creating and Using
      Quick Libraries" and "Using LINK and LIB" in the BASIC Programmer's
      Guide.